CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 28, 2026	Feb. 28, 2025	Feb. 28, 2026	Feb. 28, 2025
Income Statement [Abstract]
Interest income	$ 449,570	$ 428,860	$ 1,342,690	$ 1,266,856
Interest expense	(370,010)	(361,918)	(1,120,145)	(1,072,821)
Net interest income	79,560	66,942	222,545	194,035
Benefit for credit losses	7,405	6,093	4,597	4,270
Net interest income after benefit for credit losses	86,965	73,035	227,142	198,305
Non-interest income (loss):
Fee and other income	6,796	5,982	20,558	17,074
Derivative gains (losses)	(32,370)	40,142	(83,215)	(49,145)
Investment securities gains (losses)	(142)	663	276	6,891
Total non-interest income (loss)	(25,716)	46,787	(62,381)	(25,180)
Non-interest expense:
Salaries and employee benefits	(20,036)	(18,123)	(59,274)	(52,750)
Other general and administrative expenses	(15,936)	(15,167)	(54,950)	(52,759)
Other non-interest expense	(2,378)	(330)	(3,412)	(895)
Total non-interest expense	(38,350)	(33,620)	(117,636)	(106,404)
Income before income taxes	22,899	86,202	47,125	66,721
Income tax provision	(162)	(66)	(148)	(108)
Net income	22,737	86,136	46,977	66,613
Less: Net income attributable to noncontrolling interests	(349)	(150)	(226)	(28)
Net income attributable to CFC	$ 22,388	$ 85,986	$ 46,751	$ 66,585